/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/RigVMSchema.h
Returns true if functions definitions (not refs) can be added to the graph.
virtual bool CanAddFunction ( [URigVMController](API\Plugins\RigVMDeveloper\RigVMModel\URigVMController) * InController, const [URigVMNode](API\Plugins\RigVMDeveloper\RigVMModel\URigVMNode) * InFunctionNode ) const